"Teacher Guo......" Liu Linna walked in front of Guo Haitao and greeted softly.

"Eh, wait......" Guo Haitao raised his eyelids when he heard this, and then motioned to Liu Linna not to interfere with him.

"You wait a while, my master is usually like this, and he is quite involved in studying knowledge. Seeing this, Duan Yun explained to Liu Linna.

"Well, it doesn't matter. Liu Linna nodded when she heard this. 、

"Duan Yun, come here!" After a while, Guo Haitao beckoned to Duan Yun and said to him, "I don't understand your idea of this patch......"

"Ah, that's the ......" Duan Yun heard this, and immediately stepped forward to explain to Guo Haitao.

Liu Linna, who was on the side, frowned slightly when she heard the conversation between the two, although she also studied mathematics, but what Duan Yun and Guo Haitao talked about was obviously much beyond her cognitive level.

Seeing Duan Yun pointing at the computer screen, constantly explaining something that sounded very complex to Guo Haitao, Liu Linna's face couldn't help but flash a touch of surprise.

Honors can only represent the past, although Duan Yun has won the national mathematics Olympiad championship before, but after all, it is only a high school level math problem, and college math knowledge is completely different.

Originally, Liu Linna thought that after Duan Yun left the campus and entered the society, he had basically given up studying, but now it seems that Duan Yun couldn't help but not give up learning mathematics, but instead apprenticed to Guo Haitao and became the apprentice of this leader in the mathematics world, which is something Liu Linna never expected!

What surprised Liu Linna even more was that Duan Yun at this time actually explained something to Guo Haitao again, if she hadn't seen it with her own eyes, she wouldn't have believed it anyway!

Minutes and seconds passed......

Duan Yun and Guo Haitao's master and apprentice were still sitting in front of the coffee table, staring at the computer and talking to each other, completely treating Liu Linna on the side as air.

Fortunately, Liu Linna is a well-cultivated girl, and when she saw this scene, she didn't squeak, but just sat on the side, quietly waiting for Duan Yun, her expression seemed thoughtful......

The hour hand on the wall finally pointed to ten o'clock in the evening.

With a pleasant ringtone of her mobile phone, Liu Linna immediately stood up and walked to Duan Yun's bedroom next to her.

"Nana, where are you now?" After connecting the phone, Liu Feng's voice came from the other end of the microphone.

"Dad, I'll go home later, I'm here in Duan Yun now. Liu Linna whispered.

"You...... In Duan Yun's apartment?" Liu Feng on the other end of the phone was stunned when he heard this.

"Yes. ”

"Come back immediately!" Liu Feng's tone was a little stern, only to hear him continue: "It's ten o'clock in the evening now, it's not good for you to stay there......

"That's right, Duan Yun has a guest here, and I also know him, he is talking to Duan Yun about things now, just wait a minute, I want to talk to him for a few words. ”

"Guest? What guest is worth your wait? Come back and rest early. Liu Feng said with some disdain.

"This guest is Professor Guo, the same Professor Guo who won the second place in the Olympiad last time and presented me with an award. Liu Linna explained.

Professor Guo ...... Could it be that Professor Guo Haitao from Huaqing!?" Liu Feng's tone became surprised.

"That's right, it's him. Liu Linna nodded and said, "Professor Guo has already accepted Duan Yun as an apprentice, what kind of math problems are they working on together......

"You said that Professor Guo accepted Duan Yun as an apprentice!?"

"Yes, this is what Duan Yun said, and I think the relationship between the two of them is indeed very good. Liu Linna responded.

"That's it......" Hearing this, Liu Feng on the other end of the phone suddenly fell into a short silence, and after a while, Liu Feng said: "Since Professor Guo is also here, then it doesn't hurt for you to go home later, but wait for you to talk to Professor Guo, if he has time, I want to invite him to our house for a light meal tomorrow night." ”

"Okay. ”

"Well, pay attention to the respect for Professor Guo. After Liu Feng finished speaking, he hung up the phone directly.

After Liu Linna put her mobile phone in her pocket, she heard footsteps in the living room.

"Master drink water!" After Duan Yun poured a new cup of hot water, he respectfully sent it to Guo Haitao.

"Hmm. After solving the encryption program, Guo Haitao's expression was a little lighter, but it seemed that due to the long journey and fatigue, his face showed a little heavy tiredness.

"Later, you can lend me some more money, and I'll take a taxi back to Kyoto." After taking a sip of hot water, Guo Haitao settled down to Duan Yun.

"Huh?" Duan Yun was stunned when he heard this.

"Don't worry, I'll pay you back the money when I turn back. Guo Haitao said.

"I'm not worried about money, I have money!" Duan Yun shook his head and said, "I'm worried about your body, this is nearly a thousand kilometers away, you have just arrived in Jianghu, so you should eat something first, rest before leaving." ”

"No!" Guo Haitao shook his head and said, "This matter is very important, I must rush back to Kyoto immediately!"

"But ......"

"Professor Guo, either you wait a minute, I'll send a car to take you back to Kyoto. At this time, Liu Linna had already returned to the living room, and Zhengse said to Guo Haitao.

"Huh?" After seeing Liu Linna, Guo Haitao was stunned for a moment, and then asked Duan Yun in surprise, "When did this girl come in?"

"I've been in for a long time, and I've greeted you before. Duan Yun on the side said.

"That's right...... I didn't even pay attention to ......," Guo Haitao scratched his head.

"Professor Guo, don't you remember me? Last year, I won the second place in the National Mathematics Olympiad, or did you personally send me the award...... "Liu Linna said with a smile.

"Ah...... I remember, you and Duan Yun and Yang Ying are both classmates, your name is Liu ......"

"Liu Linna!" Duan Yun reminded.

"Ah, yes, it's called Liu Linna. Guo Haitao smiled at Liu Linna.

"Professor Guo, in fact, if you are not in a hurry to go to Kyoto, you can come to my house for a meal tomorrow night, my father wants to meet you. Liu Linna said politely to Guo Haitao.

"Forget about eating, I don't know your father ......"

"But my father, he's heard of you a long time ago. Liu Linna pondered for a moment, and then said, "And I think you must know my grandfather's ......."

"Your grandfather?" Hearing this, Guo Haitao looked even more puzzled.

"I heard my father say that my grandfather Liu Chenggong used to visit your ...... every year during the holidays."

"Your grandfather is Liu Chenggong!?" Guo Haitao heard this, and his face suddenly showed a look of surprise that could not be concealed.

"Yes. ”

"You are actually Liu Chenggong's granddaughter!" Guo Haitao was even more shocked at this moment, and then said: "Then your father is Liu Feng, right?"